问题描述：如下图，我点击新建用例后，右侧就提示404了。我的是一个javaweb项目，遇到这个想了好久不知道该怎么弄，大佬可以帮忙指正一下吗？
我的目的：点击左侧的菜单，然后右侧可以展示内容
<%@ page language="java" import="java.util.*" contentType="text/html; charset=GB2312" %>
<!DOCTYPE html>
<html lang="en" >
<head>
<meta charset="UTF-8">
<title>自动化测试数据分析平台</title>
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no">
<!--图标库-->
<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/5.14.0/css/all.min.css" charset="utf-8">
<!--核心样式-->
<link rel="stylesheet" type="text/css" href="css/aqua.min.css" charset="utf-8"/>
<link rel="stylesheet" type="text/css" href="css/style.css" charset="utf-8"/>
<!-- 引入样式 -->
<link rel="stylesheet" type="text/css" href="https://unpkg.com/element-ui/lib/theme-chalk/index.css" charset="utf-8"/>
<!-- 引入组件库 -->
<script src="http://cdn.bootcss.com/jquery/2.2.1/jquery.min.js"></script>
<script src="https://cdn.bootcss.com/echarts/4.2.1-rc1/echarts.min.js"></script>
<script src="https://unpkg.com/element-ui/lib/index.js"></script>
</head>
<body>
<div class="container flex flex-wrap justify-between">
<div class="light-mode mx-8 my-4 h-full bg-primary flex flex-col justify-between px-6 py-12 rounded overflow-hidden">
<div>
<i class="fab fa-codepen mb-8 ml-3 text-secondary-darkest text-2xl cursor-pointer"> 测试管理</i>
<div class="input-group">
<div class="btn">
<i class="icon fas fa-search"></i>
</div>
<input type="text" class="form-control" placeholder="查找用例">
</div>
<ul class="menu mt-6">
<li class="menu-item active"><i class="icon fas fa-user mr-5"></i>
<%-- <%--%>
<%-- String path = request.getContextPath();--%>
<%-- String basePath = request.getScheme()+"://"+request.getServerName()+":"+request.getServerPort()+path+"/";--%>
<%-- System.out.println(basePath);--%>
<%-- %>--%>
<a href= "process.jsp" target="myframe">新建用例</a><!--调试-->
</li>
<li class="menu-item" ><i class="icon fas fa-star mr-5" id= "iframe-page-content"></i>
<a href= "PerformanceCharts.jsp" target="myframe">性能测试报告</a></li>
<li class="menu-item"><i class="icon fas fa-check-square mr-5"></i>压测结果分析</li>
<li class="menu-item"><i class="icon fas fa-compass mr-5"></i>Web端测试报表</li>
<li class="menu-item"><i class="icon fas fa-compass mr-5"></i>Android测试报表</li>
<li class="menu-item"><i class="icon fas fa-compass mr-5"></i>接口测试报表</li>
<li class="divider"></li>
<li class="menu-item"><i class="icon fas fa-image mr-5"></i>上传数据</li>
<li class="menu-item"><i class="icon fas fa-image mr-5"></i>测试小工具</li>
<li class="menu-item"><i class="icon fas fa-image mr-5"></i>数据解析</li>
<li class="menu-item"><i class="icon fas fa-bell mr-5"></i>其它操作</li>
</ul>
</div>
<div class="flex justify-between items-center">
<div class="flex items-center cursor-pointer">
<img
src="img/1.jpg"
alt="" class="w-9 rounded-full">
<div class="ml-3 text-info-lighter">一条小小松子</div>
</div>
</div>
</div>
</div>
<iframe src="" name="myframe" width="100%" frameborder="no" border="0" marginwidth="0" marginheight=" 0" scrolling="no" allowtransparency="yes"></iframe>
<script src="js/script.js" type="text/javascript">
</script>
</body>
</html>
